Fine sand winnowing process

Abstract

According to the fine sand winnowing process applied to the related technical field of winnowing, the exhaust monitoring unit is arranged at the exhaust port of the cyclone separator, exhausted air can be monitored in real time, and therefore the situation that fine sand is not completely separated is found in time; at the moment, secondary cyclone separation can be directly controlled to be carried out on exhausted air, direct exhaust of air with a large amount of fine sand is effectively avoided, resource waste can be reduced, the influence on the environment and the health of workers can be reduced, the two cyclone separators do not need to be started all the time and are only started in the abnormal state, energy consumption is further effectively reduced, and the service life of the cyclone separators is prolonged. And on the other hand, a worker can timely discover the abnormality of fine sand separation, and compared with the current situation that it is difficult to timely discover in the prior art, the worker can conveniently and timely overhaul the equipment, and fine sand winnowing is not prone to being continuously carried out under the abnormal situation.

Description

Technical Field

[0001] The present invention relates to a fine sand air separation process, and in particular to a fine sand air separation process applied to the technical field related to air separation. Background Art

[0002] The existing particle size screening equipment cannot meet user needs. The main reason is that during the screening process, fine sand particles seriously block the screen, the screen porosity is reduced, resulting in unqualified particle size, and at the same time increasing the screen cost in the production process. It is necessary to make disruptive innovations in the screening process.

[0003] In order to solve the above problems, a method of using air separation to screen fine sand is proposed, thereby avoiding the use of screens. Air separation uses air as the sorting medium. Under the action of air flow, coarse sand has a fast sedimentation speed due to its high density and a relatively short movement distance; fine sand has a low sedimentation speed due to its low density and a relatively long movement distance. The difference in suspension speed between coarse sand and fine sand is used to separate light materials from heavier materials, that is, the fine sand is separated by wind power. For example, the specification of Chinese patent CN116550602A discloses a wind separation powder removal machine and the specification of Chinese patent CN202174006U discloses an artificial sand and gravel wind separation powder removal machine.

[0004] In the process of fine sand air separation, cyclone separators are generally used. Under normal circumstances, after cyclone separation, the separation rate of fine sand and air is high, and the air can be discharged directly. However, when the sealing of the cyclone separator is abnormal, on the one hand, the efficiency of separation of air and fine sand is reduced, resulting in some fine sand in the discharged air, which is not only easy to cause waste of fine sand, but also easy to pollute the environment and affect the health of the staff. However, it is difficult to detect the abnormality in the early stage of separation in time. When the abnormality is more serious, obvious dust will be diffused before it will be discovered. For large-scale sand and gravel plants, the amount of dust in the air is relatively high. After obvious phenomena appear, the staff is also easy to ignore it, which affects the safe and stable screening of fine sand. Therefore, large-scale sand and gravel plants generally set up multiple cyclone separators in series, and then realize multiple air separation to avoid the above problems as much as possible. However, this method is prone to cause high energy consumption in the air separation process, especially for large-scale fine sand air separation, the energy consumption will increase significantly, and the air separation cost will also increase significantly. Summary of the invention

[0005] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that when fine sand is air-separated, it is difficult to detect an abnormality in the cyclone separator, which affects the safe and stable screening of fine sand.

[0006] In order to solve the above problems, the present invention provides a fine sand air separation process, which uses an integrated air separation device for air separation. The integrated air separation device includes two brackets, an air separation machine and two cyclone separators respectively mounted on the three brackets, an air separation channel is arranged in the air separation machine, a support rod is fixedly connected between the cyclone separator and the bracket, two uniform air hoods are fixedly connected to the lower left end of the air separation machine, the two uniform air hoods are commonly connected to a Y-shaped tube, a distributor and a coarse sand discharger are respectively fixedly connected to the upper and lower ends of the air separation machine, and the upper end of the air separation machine is also fixedly connected to the A gas collecting hood is fixedly connected, a first-level material guide pipe is fixedly connected between the upper end of the gas collecting hood and the cyclone separator, an exhaust port is fixedly connected to the middle of the upper end of the cyclone separator, a first-level material guide pipe is connected between the exhaust port and the next cyclone separator, solenoid valves are installed on the exhaust port and the first-level material guide pipe, a fine sand discharger is fixedly connected to the bottom of the cyclone separator, a detection hood is also fixedly connected to the upper end of the cyclone separator, an air hole is drilled at one end of the exhaust port close to the detection hood, an exhaust pipe is fixedly connected to the upper end of the detection hood, and an exhaust monitoring unit is arranged in the detection hood; The air separation process includes the following steps: S1. First, connect the blower to the end of the Y-shaped tube, and then start the blower to blow air into the air separation channel in the air separator, and guide the raw sand into the distributor through the feeding device; S2, the raw sand falls into the air separation channel through the distributor, and under the action of the wind of the blower, the large particles of coarse sand continue to fall and fall into the coarse sand discharger, and then discharged, and the small particles of fine sand are blown away from the coarse sand discharger, and diffuse upward with the air flow, and then enter the cyclone separator along the air collecting hood and the first-level guide pipe; S3. After the airflow carrying fine sand enters the cyclone separator, a downward vortex is formed in the cyclone separator. After reaching the bottom of the cone surface of the cyclone separator, the separated fine sand is discharged through the fine sand discharger, and part of the air is discharged upward along the exhaust port. Exhaust detection is performed at regular intervals, so that part of the air enters the detection cover for detection before being discharged; S41. When the exhaust monitoring unit detects that there is no fine sand or very little fine sand in the air, the air is directly discharged; S42. When the exhaust monitoring unit detects an abnormally high content of fine sand in the air, the solenoid valve on the first exhaust port is controlled to be closed and the solenoid valve on the secondary material guide pipe is controlled to be opened, so that the exhaust air is passed into the next cyclone separator for secondary cyclone separation. At the same time, the staff is reminded of the abnormality of the bracket and corresponding treatment measures are taken in time.

[0007] In the above-mentioned fine sand air separation process, an exhaust monitoring unit can be set at the exhaust port of the cyclone separator to monitor the exhausted air, so as to detect abnormalities in time, and then facilitate timely secondary air separation of fine sand, so that there is no need to keep multiple cyclone separators open, and they are only opened in abnormal times, thereby effectively reducing energy consumption and effectively improving the effect of fine sand separation. It can effectively avoid the direct discharge of air with a lot of fine sand, reduce waste of resources, and reduce the impact on the environment and the health of workers.

[0008] As a further improvement of the present application, the air selection channel includes a feeding section, a sand-prone section, and an air guide section which are respectively connected to the distributor, the air collecting hood, and the air equalizing hood, and a separation section which is simultaneously connected to the feeding section, the sand-prone section, and the air guide section, the air guide section being connected to the bottom of the separation section, and the feeding section and the sand-prone section being connected to the upper end of the separation section.

[0009] As a further improvement of the present application, the exhaust monitoring unit includes a chassis connected to the bottom of the detection cover through an electric turntable, a sealing strip connected to the edge of a micro-camera, a micro-camera installed in the middle of one end of the sealing strip facing the axis of the chassis, and a sand measuring roller group installed on the upper end of the chassis, a gas measuring membrane is connected to the sand measuring roller group, the detection end of the micro-camera faces the middle of the sand measuring roller group, one end of the sealing strip is a flat surface, and the other end is an arc surface, and the arc surface is an elastic structure.

[0010] As a further improvement of the present application, the sand measuring roller group includes a bottom plate fixedly connected to the chassis, a main roller shaft and a secondary roller shaft respectively connected to the two upper ends of the bottom plate through an electric rotating shaft, and a film connecting roller located on the side of the main roller shaft away from the exhaust port, and a gas measuring film is wound on the main roller shaft. The gas measuring film includes a back glue layer and an isolation layer that fit each other, and one end of the back glue layer and the isolation layer are fixedly connected to the shaft body of the main roller shaft, and the other ends of the back glue layer and the isolation layer are respectively fixedly connected to the secondary roller shaft and the film connecting roller.

[0011] As a further improvement of the present application, the back adhesive layer is made of an inelastic transparent material, and the upper and lower edges of the back adhesive layer are hemmed, and the surface of the back adhesive layer facing the central axis of the main roller shaft is coated with an adhesive layer.

[0012] As a further improvement of the present application, a gap is left between the main roller shaft and the auxiliary roller shaft, the gap is directly opposite to the air hole, and the maximum span of the gap is greater than the width of the air hole.

[0013] As a further improvement of the present application, the chassis and the detection cover are eccentrically arranged. When the sealing strip is close to the exhaust port, the sealing strip contacts the air hole. When the sand measuring roller group is toward the exhaust port, the main roller shaft and the auxiliary roller shaft do not contact the exhaust port.

[0014] As a further improvement of the present application, the exhaust gas detection operation in step S3 specifically comprises the following steps: S31, firstly, the main roller and the auxiliary roller are controlled to rotate in opposite directions by the electric rotating shaft, and at the same time, the film splicing roller rotates in the same direction as the main roller, so that the old adhesive layer is wound by the auxiliary roller, and the outer isolation layer is separated from the adhesive layer and wound by the film splicing roller, so that the new adhesive layer is transferred between the main roller and the auxiliary roller; S32, then the exhaust monitoring unit is controlled by the electric turntable to rotate 180 degrees, so that the sealing strip is separated from the air hole, and the middle of the new adhesive layer is facing the air hole. At this time, the adhesive layer faces the air hole, and then part of the air will enter the detection cover along the air hole and be directly sprayed on the adhesive layer, and the micro camera can directly capture the changes in the adhesive layer; S331. When there is no fine sand or very little fine sand in the exhausted air, the transparency of the adhesive layer does not change or changes very little, and the image information of the adhesive layer captured by the micro camera changes very little; S332. When the exhausted air contains fine sand, the fine sand will be sprayed onto the adhesive layer along with the air, and then adhered by the adhesive layer on the adhesive layer. At this time, the micro camera can capture a large change in the image information at the adhesive layer.

[0015] As another improvement of the present application, the adhesive layer is distributed in discontinuous strips, so that a plurality of pre-attached sand layers and sand-avoiding layers spaced apart from each other are formed on the surface of the back adhesive layer, and the sand-avoiding layer is also made of a transparent material. An LED lamp is also installed at the mouth of the air hole located in the detection cover, and a protective cover is provided on the outer cover of the LED lamp, which is installed on the outside of the exhaust port through an electric rotating shaft.

[0016] In summary, an exhaust monitoring unit can be set at the exhaust port of the cyclone separator, and the exhausted air can be monitored in real time, so as to promptly detect incomplete separation of fine sand. On the one hand, at this time, the exhausted air can be directly controlled to undergo secondary cyclone separation, effectively avoiding direct discharge of air with a large amount of fine sand, which can not only reduce waste of resources, but also reduce the impact on the environment and the health of workers. In addition, the two cyclone separators do not need to be turned on all the time, but only turned on in abnormal situations, thereby effectively reducing energy consumption. On the other hand, the staff can promptly detect abnormalities in fine sand separation, which is convenient for the staff to promptly inspect and repair the equipment compared to the current situation in which it is difficult to detect in time in the prior art, so that the air selection of fine sand is not easy to continue under abnormal circumstances. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a flow chart of the first implementation method of the present application; Figure 2 It is a partial right perspective view of the first embodiment of the present application; Figure 3 This is a partial left perspective view of the first embodiment of the present application; Figure 4This is a schematic diagram of the winnowing process of the first embodiment of the present application; Figure 5 This is a schematic diagram of the top portion of a cyclone separator according to a first embodiment of the present application; Figure 6 A three-dimensional diagram of an exhaust monitoring unit according to a first embodiment of the present application; Figure 7 A top view of the exhaust air monitoring unit when detecting the exhaust air according to the first embodiment of the present application; Figure 8 A top view of the exhaust air monitoring unit when the exhaust air is not detected in the first embodiment of the present application; Fig. 9 This is a schematic diagram of a top view of a sand measuring roller assembly when the exhausted air contains fine sand in the first embodiment of the present application; Fig.10 A diagram of the adhesive layer portion of the second embodiment of the present application; Fig.11 This is a comparison diagram of the changes in the adhesive layer captured by the micro camera under different conditions in the second embodiment of the present application. Description of the numbers in the figure: 1 bracket, 2 air separator, 21 Y-shaped tube, 22 uniform air hood, 201 distributor, 202 coarse sand discharger, 3 cyclone separator, 301 support rod, 302 fine sand discharger, 303 exhaust port, 41 air collecting hood, 42 primary material guide pipe, 43 secondary material guide pipe, 51 unloading section, 52 near sand section, 53 separation section, 54 air guide section, 6 detection hood, 601 exhaust pipe, 602 air hole, 61 sealing strip, 62 miniature camera, 63 chassis, 7 sand measuring roller group, 71 main roller shaft, 72 auxiliary roller shaft, 73 film joining roller, 701 bottom plate, 8 air measuring film, 81 adhesive layer, 82 isolation layer, 801 pre-attached sand layer, 802 sand avoiding layer. DETAILED DESCRIPTION

[0018] Two implementation modes of the present application are described in detail below with reference to the accompanying drawings.

[0019] The first implementation method: Figure 1-3As shown, a in the figure represents a blower, a fine sand air separation process, the air separation process uses an integrated air separation device for air separation, the integrated air separation device includes two brackets 1 and air separation machines 2 and two cyclone separators 3 respectively mounted on the three brackets 1, an air separation channel is arranged in the air separation machine 2, a support rod 301 is fixedly connected between the cyclone separator 3 and the bracket 1, two uniform air hoods 22 are fixedly connected to the lower left end of the air separation machine 2, and the two uniform air hoods 22 are commonly connected to a Y-shaped tube 21, a distributor 201 and a coarse sand discharger 202 are fixedly connected at the upper and lower ends of the air separation machine 2, and an air collecting hood 4 is also fixedly connected to the upper end of the air separation machine 2. 1. A primary material guide pipe 42 is fixedly connected between the upper end of the air collecting hood 41 and the cyclone separator 3. An exhaust port 303 is fixedly connected to the middle of the upper end of the cyclone separator 3. A primary material guide pipe 42 is connected between the exhaust port 303 and the next cyclone separator 3. Solenoid valves are installed on the exhaust port 303 and the primary material guide pipe 42. A fine sand discharger 302 is fixedly connected to the bottom of the cyclone separator 3. A detection hood 6 is also fixedly connected to the upper end of the cyclone separator 3. An air hole 602 is drilled at one end of the exhaust port 303 close to the detection hood 6. An exhaust pipe 601 is fixedly connected to the upper end of the detection hood 6. An exhaust monitoring unit is arranged in the detection hood 6. The air separation process includes the following steps: S1. First, connect a blower to the end of the Y-shaped tube 21, and then start the blower to blow air into the air separation channel in the air separator 2, and introduce the raw sand into the distributor 201 through the feeding device; S2, the raw sand falls into the air separation channel through the distributor 201, and under the action of the wind of the blower, the large particles of coarse sand continue to fall and fall into the coarse sand discharger 202, and then discharged, and the small particles of fine sand are blown away from the coarse sand discharger 202, and diffuse upward with the air flow, and then enter the cyclone separator 3 along the air collecting hood 41 and the primary guide pipe 42; S3, after the airflow carrying fine sand enters the cyclone separator 3, a downward vortex is formed in the cyclone separator 3. After reaching the bottom of the cone surface of the cyclone separator 3, the separated fine sand is discharged through the fine sand discharger 302, and part of the air is discharged upward along the exhaust port 303. Exhaust detection is performed at regular intervals, so that part of the air enters the detection cover 6 for detection before being discharged; The specific steps of the exhaust gas detection operation in step S3 are: S31, firstly, the main roller 71 and the auxiliary roller 72 are controlled to rotate in opposite directions by the electric rotating shaft, and at the same time, the film joining roller 73 rotates in the same direction as the main roller 71, so that the old adhesive layer 81 is wound by the auxiliary roller 72, and the outer isolation layer 82 is separated from the adhesive layer 81 and wound by the film joining roller 73, so that the new adhesive layer 81 is transferred between the main roller 71 and the auxiliary roller 72; S32, then the exhaust monitoring unit is rotated 180 degrees by the electric turntable to separate the sealing strip 61 from the air hole 602, and the middle of the new adhesive layer 81 is facing the air hole 602. At this time, the adhesive layer faces the side of the air hole 602, and then part of the air will enter the detection cover 6 along the air hole 602 and directly spray on the adhesive layer 81, and the micro camera 62 can directly capture the changes in the adhesive layer 81; S331, when there is no fine sand or very little fine sand in the exhausted air, the transparency of the adhesive layer 81 does not change or changes very little, and the image information of the adhesive layer 81 captured by the micro camera 62 changes very little; S332, when the exhausted air contains fine sand, the fine sand will be sprayed onto the adhesive layer 81 along with the air, and then adhered by the adhesive layer on the adhesive layer 81. At this time, the micro camera 62 can capture a large change in the image information at the adhesive layer 81; S41. When the exhaust monitoring unit detects that there is no fine sand or very little fine sand in the air, the air is directly discharged; S42. When the exhaust monitoring unit detects that the fine sand content in the air is abnormally increased, the solenoid valve on the first exhaust port 303 is controlled to be closed, and the solenoid valve on the secondary material guide pipe 43 is controlled to be opened, so that the exhaust air is passed into the next cyclone separator 3 for secondary cyclone separation, and at the same time, the staff is reminded of the abnormality of the bracket 1 and takes corresponding treatment measures in time.

[0020] In the above-mentioned fine sand air separation process, an exhaust monitoring unit can be set at the exhaust port of the cyclone separator 3 to monitor the exhausted air, so as to detect abnormalities in time, and then facilitate timely secondary air separation of fine sand, so that there is no need to keep multiple cyclone separators 3 open, and they are only opened when abnormalities occur, thereby effectively reducing energy consumption and effectively improving the effect of fine sand separation. It can effectively avoid the direct discharge of air with a lot of fine sand, reduce waste of resources, and reduce the impact on the environment and the health of workers.

[0021] like Figure 4The air selection channel includes a material discharge section 51, a sand-proximate section 52, and an air guide section 54 which are respectively connected to the distributor 201, the air collecting hood 41, and the air uniforming hood 22, and a separation section 53 which is simultaneously connected to the material discharge section 51, the sand-proximate section 52, and the air guide section 54. The air guide section 54 is connected to the bottom of the separation section 53, and the material discharge section 51 and the sand-proximate section 52 are connected to the upper end of the separation section 53. After the raw sand enters the air separator 2 from the material distributor 201, it enters the folded-line air selection channel, in which it first enters the material discharge section 51, and then enters the separation section 53 downward along the folded line. The air enters from the bottom of the zigzag air selection channel through the Y-shaped tube 21 and the air equalizing hood 22, and intersects with the falling raw sand along the air guide section 54. The coarse sand with larger particles has a greater gravity and can directly fall into the coarse sand discharger 202, while the fine sand with smaller particles has a lighter gravity and is difficult to fall under the blowing of the airflow. It will go up with the air, pass through the separation section 53 and enter the near-sand section 52, and enter the cyclone separator 3 along the air collecting hood 41 and the first-level guide pipe 42 for cyclone separation, so that the fine sand will eventually fall through the fine sand discharger 302 and be collected.

[0022] The zigzag-shaped air separation channel can effectively improve the path of raw sand feeding and increase the number of collisions, thereby making the raw sand in a disordered state after multiple collisions. When subjected to the air flow from below, the fine sand can be better separated from the coarse sand and move toward the air collecting hood 41 in response to the air flow.

[0023] It is worth noting that, according to actual needs, an exhaust fan can be additionally installed at the first-level material guide pipe 42 to assist in the separation of fine sand and coarse sand in the air separation channel.

[0024] like Figure 5-6 The exhaust monitoring unit includes a chassis 63 connected to the bottom of the detection cover 6 through an electric turntable, a sealing strip 61 connected to the edge of a micro camera 62, a micro camera 62 installed in the middle of one end of the sealing strip 61 facing the axis of the chassis 63, and a sand measuring roller group 7 installed on the upper end of the chassis 63, the sand measuring roller group 7 is connected to a gas measuring film 8, and the detection end of the micro camera 62 faces the middle of the sand measuring roller group 7. Figure 6The sand measuring roller group 7 includes a bottom plate 701 fixedly connected to the chassis 63, a main roller shaft 71 and a secondary roller shaft 72 respectively connected to the two upper ends of the bottom plate 701 through an electric rotating shaft, and a film-joining roller 73 located on the side of the main roller shaft 71 away from the exhaust port 303. A gas measuring film 8 is wound on the main roller shaft 71. The gas measuring film 8 includes a back adhesive layer 81 and an isolation layer 82 that are bonded to each other, and one end of the back adhesive layer 81 and the isolation layer 82 are fixedly connected to the shaft body of the main roller shaft 71, and the other ends of the back adhesive layer 81 and the isolation layer 82 are respectively fixedly connected to the secondary roller shaft 72 and the film-joining roller 73, and the back adhesive layer 81 is non-elastic. The adhesive layer 81 is made of a transparent material, and the upper and lower edges of the adhesive layer 81 are hemmed, and the surface of the adhesive layer 81 facing the central axis of the main roller 71 is coated with an adhesive layer, and the adhesive layer is also transparent, wherein the isolation layer 82 is used to protect the adhesive layer 81, so that when it is on the surface of the main roller 71, it can intercept dust or fine sand in the air. When inspection is required, the dusty isolation layer 82 is wound by the film-joining roller 73 to make the adhesive layer 81 completely exposed, which can effectively avoid the influence of dust on the back of the adhesive layer 81 when not inspected, thereby effectively protecting the accuracy of the inspection result.

[0025] One end of the sealing strip 61 is a flat surface, and the other end is a curved surface, and the curved surface is an elastic structure, such as Figure 7-8 , the chassis 63 and the detection cover 6 are eccentrically arranged, such as Figure 8 When the sealing strip 61 is close to the exhaust port 303, the sealing strip 61 contacts the mouth of the air hole 602. When the sand measuring roller group 7 is toward the exhaust port 303, the main roller shaft 71 and the auxiliary roller shaft 72 are not in contact with the exhaust port 303. When the exhausted air is detected, Figure 7 , the electric turntable can be used to switch the positions of the sand measuring roller group 7 and the sealing strip 61 during normal rotation, so that the sand measuring roller group 7 is facing the air hole 602. At this time, there is a certain distance between the sand measuring roller group 7 and the air hole 602. When air enters the detection cover 6 along the air hole 602, as shown in FIG. Fig. 9 , so that the air can be directly sprayed on the air measuring membrane 8 on the sand measuring roller group 7. The air measuring membrane 8 is sticky. When the air contains more fine sand, the air measuring membrane 8 can quickly absorb more fine sand, thereby causing the image obtained by the micro camera 62 to change significantly. Based on this, it can be judged that the discharged air is abnormal and secondary cyclone separation is required. After the detection, no additional operation is required. Only by rotating the electric turntable 180° again, the sealing strip 61 can be returned to the air hole 602 and the air hole 602 can be blocked, so that the air can be directly discharged along the exhaust port 303.

[0026] There is a gap between the main roller 71 and the auxiliary roller 72. The gap is opposite to the air hole 602, and the maximum span of the gap is greater than the width of the air hole 602. The unwound portion of the back adhesive layer 81 is just located in the gap. When the exhausted air is detected, the air can be directly sprayed on the gas measuring film 8, which is convenient for the gas measuring film 8 to adhere to and absorb sand. When fine sand exists in the exhausted air, the micro camera 62 can quickly obtain the information.

[0027] It is worth noting that, according to actual needs, a protective cover can be installed on the outside of the micro camera 62 through an electric shaft, which is only opened during detection, so that the lens of the micro camera 62 is not easily adhered to fine sand, thereby ensuring the accuracy of the image information obtained during detection. In addition, the surface of the lens cover of the micro camera 62 is coated with a nano-dustproof and anti-static coating, which can effectively prevent dust or fine sand from adhering to its surface.

[0028] In summary, an exhaust monitoring unit can be set at the exhaust port of the cyclone separator 3, and the exhausted air can be monitored in real time, so as to promptly detect the incomplete separation of fine sand. On the one hand, at this time, the exhausted air can be directly controlled to undergo secondary cyclone separation, effectively avoiding the direct discharge of air with a large amount of fine sand, which can not only reduce the waste of resources, but also reduce the impact on the environment and the health of the staff. In addition, the two cyclone separators 3 do not need to be turned on all the time, but only turned on in abnormal circumstances, thereby effectively reducing energy consumption. On the other hand, the staff can promptly detect the abnormality of fine sand separation, which is convenient for the staff to promptly inspect and repair the equipment compared to the current situation in which it is difficult to detect in time in the prior art, so that the air selection of fine sand is not easy to continue under abnormal circumstances.

[0029] The second implementation method: This embodiment further improves the exhaust monitoring unit on the basis of the first embodiment, and the rest of the parts remain the same as the first embodiment.

[0030] Fig.10 As shown, the adhesive layer is distributed in discontinuous strips, so that a plurality of pre-attached sand layers 801 and sand-avoiding layers 802 are formed on the surface of the back adhesive layer 81, and the sand-avoiding layer 802 is also made of transparent material. The air hole 602 is located at the mouth of the detection cover 6 and an LED lamp is also installed, and the outer cover of the LED lamp is provided with a protective cover, which is installed on the outside of the exhaust port 303 through an electric shaft. Fig.11, so that when the exhausted air is detected, the LED light is turned on. When there is no fine sand in the air, the surface of the gas measuring film 8 will not change significantly. At this time, the entire area of ​​the image of the gas measuring film 8 obtained by the micro camera 62 is translucent; when there is more fine sand, the fine sand will adhere to the strip-shaped adhesive layer, so that the pre-attached sand layer 801 will obviously absorb more fine sand, while there is no or only very little fine sand attached to the sand avoiding layer 802. At this time, the sand avoiding layer 802 will be obviously translucent, producing an obvious translucent strip, while the pre-attached sand layer 801 will produce a light-impermeable strip. When the fine sand content in the air is less, the light transmission at the translucent strip is relatively weak. Based on magnetism, when there is fine sand in the exhausted air, the image information characteristics obtained by the micro camera 62 are more obvious, so that the detection result is more accurate, and the amount of fine sand carried in the air can be roughly judged, which is convenient for the staff to understand the situation in time and then take corresponding measures.

[0031] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A fine sand air separation process, characterized in that: The air separation process utilizes an integrated air separation device for air separation. The integrated air separation device comprises two brackets (1), and an air separation machine (2) and two cyclone separators (3) respectively mounted on the three brackets (1). An air separation channel is arranged in the air separation machine (2). A support rod (301) is fixedly connected between the cyclone separator (3) and the bracket (1). Two uniform air hoods (22) are fixedly connected to the lower left end of the air separation machine (2). The two uniform air hoods (22) are commonly connected to a Y-shaped tube (21). A distributor (201) and a coarse sand discharger (202) are respectively fixedly connected to the upper and lower ends of the air separation machine (2). An air collecting hood (41) is also fixedly connected to the upper end of the air separation machine (2). The upper end of the air collecting hood (41) is connected to the upper end of the air separation machine (41). A primary material guide pipe (42) is fixedly connected between the cyclone separators (3); an exhaust port (303) is fixedly connected to the middle of the upper end of the cyclone separator (3); a primary material guide pipe (42) is connected between the exhaust port (303) and the next cyclone separator (3); solenoid valves are installed on the exhaust port (303) and the primary material guide pipe (42); a fine sand discharger (302) is fixedly connected to the bottom of the cyclone separator (3); a detection cover (6) is also fixedly connected to the upper end of the cyclone separator (3); an air hole (602) is drilled at one end of the exhaust port (303) close to the detection cover (6); an exhaust pipe (601) is fixedly connected to the upper end of the detection cover (6); and an exhaust monitoring unit is arranged inside the detection cover (6); The air separation process comprises the following steps: S1. First, a blower is connected to the end of the Y-shaped tube (21), and then the blower is started to blow air into the air separation channel in the air separator (2), and the raw sand is introduced into the distributor (201) through the feeding device; S2, the raw sand falls into the air separation channel through the distributor (201), and at the same time, under the action of the wind of the blower, the coarse sand with large particles continues to fall and falls into the coarse sand discharger (202), and then is discharged, and the fine sand with small particles is blown away from the coarse sand discharger (202), and diffuses upward with the air flow, and then enters the cyclone separator (3) along the air collecting hood (41) and the first-level guide pipe (42); S3, after the airflow carrying fine sand enters the cyclone separator (3), a downward swirling flow is formed in the cyclone separator (3). After reaching the bottom of the conical surface of the cyclone separator (3), the separated fine sand is discharged through the fine sand discharger (302), and part of the air is discharged upward along the exhaust port (303). Exhaust detection is performed at regular intervals, so that part of the air enters the detection cover (6) for detection before being discharged; S41. When the exhaust monitoring unit detects that there is no fine sand or very little fine sand in the air, the air is directly discharged; S42. When the exhaust monitoring unit detects that the fine sand content in the air is abnormally increased, the electromagnetic valve on the first exhaust port (303) is controlled to be closed, and the electromagnetic valve on the secondary material guide pipe (43) is controlled to be opened, so that the exhaust air is passed into the next cyclone separator (3) for secondary cyclone separation, and at the same time, the staff is reminded of the abnormality of the bracket (1) so that corresponding treatment measures can be taken in time.

2. A fine sand air separation process according to claim 1, characterized in that: The air selection channel is in a folded line shape, and comprises a material discharge section (51), a sand-proximate section (52), and an air guide section (54) which are respectively connected to the distributor (201), the air collecting hood (41), and the air equalizing hood (22), and a separation section (53) which is simultaneously connected to the material discharge section (51), the sand-proximate section (52), and the air guide section (54); the air guide section (54) is connected to the bottom of the separation section (53), and the material discharge section (51) and the sand-proximate section (52) are connected to the upper end of the separation section (53).

3. A fine sand air separation process according to claim 2, characterized in that: The exhaust monitoring unit comprises a chassis (63) connected to the bottom of the detection cover (6) via an electric turntable, a sealing strip (61) connected to the edge of the micro camera (62), the micro camera (62) installed at the middle of one end of the sealing strip (61) facing the axis of the chassis (63), and a sand measuring roller group (7) installed at the upper end of the chassis (63), the sand measuring roller group (7) being connected to an air measuring membrane (8), the detection end of the micro camera (62) facing the middle of the sand measuring roller group (7), one end of the sealing strip (61) being a straight surface and the other end being a curved surface, and the curved surface being an elastic structure.

4. A fine sand air separation process according to claim 3, characterized in that: The sand measuring roller group (7) comprises a bottom plate (701) fixedly connected to the bottom plate (63), a main roller shaft (71) and a secondary roller shaft (72) respectively connected to the two upper ends of the bottom plate (701) via an electric rotating shaft, and a film joining roller (73) located on the side of the main roller shaft (71) away from the exhaust port (303), a gas measuring film (8) being wound on the main roller shaft (71), the gas measuring film (8) comprising a backing adhesive layer (81) and an isolation layer (82) which are bonded to each other, one end of each of the backing adhesive layer (81) and the isolation layer (82) being fixedly connected to the shaft body of the main roller shaft (71), and the other ends of each of the backing adhesive layer (81) and the isolation layer (82) being fixedly connected to the secondary roller shaft (72) and the film joining roller (73), respectively.

5. A fine sand air separation process according to claim 4, characterized in that: The adhesive backing layer (81) is made of an inelastic transparent material, and the upper and lower edges of the adhesive backing layer (81) are edge-wrapped, and the surface of the adhesive backing layer (81) facing the central axis of the main roller shaft (71) is coated with an adhesive layer.

6. A fine sand air separation process according to claim 5, characterized in that: A gap is left between the main roller shaft (71) and the auxiliary roller shaft (72), the gap is directly opposite to the air hole (602), and the maximum span of the gap is greater than the width of the air hole (602).

7. A fine sand air separation process according to claim 6, characterized in that: The chassis (63) and the detection cover (6) are eccentrically arranged, and when the sealing strip (61) is close to the exhaust port (303), the sealing strip (61) contacts the mouth of the air hole (602), and when the sand measuring roller group (7) faces the exhaust port (303), neither the main roller shaft (71) nor the auxiliary roller shaft (72) contacts the exhaust port (303).

8. A fine sand air separation process according to claim 7, characterized in that: The exhaust gas detection operation in step S3 specifically comprises the following steps: S31, firstly, the main roller (71) and the auxiliary roller (72) are controlled to rotate in opposite directions by an electric rotating shaft, and at the same time, the film-joining roller (73) and the main roller (71) rotate in the same direction, so that the old adhesive layer (81) is wound by the auxiliary roller (72), and the outer isolation layer (82) is separated from the adhesive layer (81) and wound by the film-joining roller (73), so that the new adhesive layer (81) is transferred between the main roller (71) and the auxiliary roller (72); S32, then the exhaust monitoring unit is rotated 180 degrees by controlling the electric turntable to separate the sealing strip (61) from the air hole (602), and the middle of the new adhesive layer (81) is directly opposite to the air hole (602). At this time, the adhesive layer faces the side of the air hole (602), and then part of the air will enter the detection cover (6) along the air hole (602) and be directly sprayed on the adhesive layer (81), and the micro camera (62) can directly capture the changes in the adhesive layer (81); S331, when there is no fine sand or very little fine sand in the exhausted air, the transparency of the adhesive layer (81) does not change or changes very little, and the image information of the adhesive layer (81) captured by the micro camera (62) changes very little; S332. When the exhausted air contains fine sand, the fine sand will be sprayed onto the adhesive layer (81) along with the air, and then adhered to the adhesive layer on the adhesive layer (81). At this time, the micro camera (62) can capture a large change in the image information at the adhesive layer (81).

9. A fine sand air separation process according to claim 6, characterized in that: The adhesive layer is distributed in a discontinuous strip shape, so that a plurality of pre-attached sand layers (801) and sand-avoiding layers (802) spaced apart from each other are formed on the surface of the back adhesive layer (81), and the sand-avoiding layer (802) is also made of a transparent material. The opening of the air hole (602) located in the detection cover (6) is also equipped with an LED lamp, and the outer cover of the LED lamp is provided with a protective cover, which is installed on the outside of the exhaust port (303) via an electric rotating shaft.

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